Topriceanu CC, Moon JC, Hardy R, et al. - Longitudinal birth cohort data show that childhood bradycardia triples the risk of developing atrioventricular conduction abnormalities in later life, with 88% of these anomalies being benign. Furthermore, it has no effect on mortality or heart size and function.

• One in every three older persons with atrioventricular conduction defects had been bradycardic in childhood, with 12% having serious problems (Mobitz type II second‐degree atrioventricular block or higher).

• Childhood bradycardia was related to 2.91 greater risks of atrioventricular conduction defects in fully adjusted models.

• In random coefficients mixed generalized linear models, associations persisted.

• A linear connection between the log chances of atrioventricular conduction abnormalities at 60 to 64 years of age and resting heart rate at 7 years of age was established using fractional polynomials.

• There was no link found between childhood bradycardia and mortality outcomes, or between echocardiographic parameters and ventricular conduction abnormalities in older age.